ansible-test ansible-doc sanity test: also run with --json parameter (#69288)

changelogs/fragments/69288-ansible-test-ansible-doc-json.yml

@@ -0,0 +1,2 @@
+minor_changes:
+- "ansible-test - also run the ``ansible-doc`` sanity test with ``--json`` to ensure that the documentation does not contain something that cannot be exported as JSON (https://github.com/ansible/ansible/issues/69238)."

test/lib/ansible_test/_internal/sanity/ansible_doc.py

@@ -103,7 +103,11 @@ class AnsibleDocTest(SanitySingleVersion):
         error_messages = []
 
         for doc_type in sorted(doc_targets):
-            cmd = ['ansible-doc', '-t', doc_type] + sorted(doc_targets[doc_type])
+            for format_option in [None, '--json']:
+                cmd = ['ansible-doc', '-t', doc_type]
+                if format_option is not None:
+                    cmd.append(format_option)
+                cmd.extend(sorted(doc_targets[doc_type]))
 
                 try:
                     with coverage_context(args):